Change on filter

WebApi/Endpoints/PlayListEndpoints.cs

@@ -12,8 +12,7 @@ public static class PlayListEndpoints
     public static IEndpointRouteBuilder MapPlayListEndpoints(this IEndpointRouteBuilder app)
     {
         var group = app.MapGroup("/playlists")
-            .WithTags("PlayLists")
-            .AddEndpointFilter<ValidationFilter>();
+            .WithTags("PlayLists");
 
         group.MapGet("/", GetPlayLists)
             .WithName("GetPlayLists")
@@ -29,11 +28,13 @@ public static class PlayListEndpoints
 
         group.MapPost("/users/{userId}", CreatePlayList)
             .WithName("CreatePlayList")
-            .WithSummary("Create a new playlist.");
+            .WithSummary("Create a new playlist.")
+            .AddEndpointFilter<ValidationFilter<CreatePlayListRequest>>();
 
         group.MapPut("/{playlistId}/users/{userId}", UpdatePlayList)
             .WithName("UpdatePlayList")
-            .WithSummary("Update an existing playlist.");
+            .WithSummary("Update an existing playlist.")
+            .AddEndpointFilter<ValidationFilter<UpdatePlayListRequest>>();
 
         group.MapDelete("/{playlistId}/users/{userId}", DeletePlayList)
             .WithName("DeletePlayList")
@@ -41,7 +42,8 @@ public static class PlayListEndpoints
 
         group.MapPost("/upload-picture/users/{userId}", RequestPlayListPictureUpload)
             .WithName("RequestPlayListPictureUpload")
-            .WithSummary("Request a pre-signed URL to upload a playlist picture.");
+            .WithSummary("Request a pre-signed URL to upload a playlist picture.")
+            .AddEndpointFilter<ValidationFilter<RequestPlayListPictureUploadRequest>>();
 
         return app;
     }

WebApi/Endpoints/TrackEndpoints.cs

@@ -12,8 +12,7 @@ public static class TrackEndpoints
     public static IEndpointRouteBuilder MapTrackEndpoints(this IEndpointRouteBuilder app)
     {
         var group = app.MapGroup("/tracks")
-            .WithTags("Tracks")
-            .AddEndpointFilter<ValidationFilter>();
+            .WithTags("Tracks");
 
         group.MapGet("/", GetTracks)
             .WithName("GetTracks")
@@ -29,7 +28,8 @@ public static class TrackEndpoints
 
         group.MapPost("/users/{userId}", CreateTrack)
             .WithName("CreateTrack")
-            .WithSummary("Create a new track.");
+            .WithSummary("Create a new track.")
+            .AddEndpointFilter<ValidationFilter<CreateTrackRequest>>();
 
         group.MapDelete("/{trackId}/users/{userId}", DeleteTrack)
             .WithName("DeleteTrack")
@@ -37,7 +37,8 @@ public static class TrackEndpoints
 
         group.MapPost("/upload-urls/users/{userId}", RequestTrackUploadUrls)
             .WithName("RequestTrackUploadUrls")
-            .WithSummary("Request pre-signed URLs to upload track picture and audio.");
+            .WithSummary("Request pre-signed URLs to upload track picture and audio.")
+            .AddEndpointFilter<ValidationFilter<RequestTrackUploadUrlsRequest>>();
 
         return app;
     }

WebApi/Endpoints/UserEndpoints.cs

@@ -12,8 +12,7 @@ public static class UserEndpoints
     public static IEndpointRouteBuilder MapUserEndpoints(this IEndpointRouteBuilder app)
     {
         var group = app.MapGroup("/users")
-            .WithTags("Users")
-            .AddEndpointFilter<ValidationFilter>();
+            .WithTags("Users");
 
         group.MapGet("/", GetUsers)
             .WithName("GetUsers")
@@ -29,7 +28,8 @@ public static class UserEndpoints
 
         group.MapPost("/", CreateUser)
             .WithName("CreateUser")
-            .WithSummary("Create a new user.");
+            .WithSummary("Create a new user.")
+            .AddEndpointFilter<ValidationFilter<CreateUserRequest>>();
 
         return app;
     }

WebApi/Filters/ValidationFilter.cs

@@ -2,27 +2,19 @@ using FluentValidation;
 
 namespace WebApi.Filters;
 
-public sealed class ValidationFilter : IEndpointFilter
+public sealed class ValidationFilter<T>(IValidator<T> validator) : IEndpointFilter where T : class
 {
     public async ValueTask<object?> InvokeAsync(EndpointFilterInvocationContext context, EndpointFilterDelegate next)
     {
-        foreach (var argument in context.Arguments)
-        {
+        var argument = context.Arguments.OfType<T>().FirstOrDefault();
+
         if (argument is null)
-                continue;
-
-            var validatorType = typeof(IValidator<>).MakeGenericType(argument.GetType());
-
-            if (context.HttpContext.RequestServices.GetService(validatorType) is not IValidator validator)
-                continue;
-
-            var validationContext = new ValidationContext<object>(argument);
-            var result = await validator.ValidateAsync(validationContext, context.HttpContext.RequestAborted);
-
-            if (!result.IsValid)
-                return Results.ValidationProblem(result.ToDictionary());
-        }
-
             return await next(context);
+
+        var result = await validator.ValidateAsync(argument, context.HttpContext.RequestAborted);
+
+        return result.IsValid
+            ? await next(context)
+            : Results.ValidationProblem(result.ToDictionary());
     }
 }